Kapadia M K, Gilbert C D, Westheimer G
Department of Neurobiology, Rockefeller University, New York, New York 10021.
J Neurosci. 1994 Jan;14(1):451-7. doi: 10.1523/JNEUROSCI.14-01-00451.1994.
The human visual system is normally very good at determining the relative positions of objects in space, but under certain conditions contextual influences can cause significant errors in this process. We studied spatial localization around an artificial scotoma, a small mask that occludes part of the visual field while a dynamic pattern is shown over a surrounding region, and found that the ability to determine the position of short line segments was strongly biased toward the interior of the scotoma. We attribute this "shift" or misassignment of position to receptive field (RF) expansions within the artificial scotoma as seen in recent physiological studies. Furthermore, our findings show that this shift begins within 1 sec of stimulus presentation, suggesting that RFs are constantly altered by their local context and that these dynamics are a part of normal vision.
人类视觉系统通常非常擅长确定空间中物体的相对位置，但在某些情况下，情境影响会导致这一过程中出现重大误差。我们研究了围绕人工盲点的空间定位，人工盲点是一个小遮罩，它会遮挡部分视野，同时在周围区域显示动态图案，结果发现，确定短线段位置的能力强烈偏向于盲点内部。正如最近的生理学研究所显示的，我们将这种位置的“偏移”或错误分配归因于人工盲点内感受野（RF）的扩展。此外，我们的研究结果表明，这种偏移在刺激呈现后1秒内就开始了，这表明感受野会因其局部环境而不断改变，并且这些动态变化是正常视觉的一部分。
